Magnetic separator for use in connection with an endless conveyor



May 10, 1955 5. J. KOREN 2,703,034

MAGNETIC SEPARATOR FOR USE IN CONNECTION WITH AN ENDLESS CONVEYOR Filed May 5, 1955 3 Sheets-Sheet l 0, 1955 G. J. KOREN MAGNETIC SEPARATOR FOR USE IN CONNECTION WITH AN ENDLESS CONVEYOR 3 Sheets-Sheet 2 Filed May 5, 1953 May 10, 1955 ca. J. KOREN 2,708,034

MAGNETIC SEPARATOR FOR USE IN CONNECTION WITH AN ENDLESS CONVEYOR Filed May 5, 1953 3 Sheets-Sheet 3 five/2207 ear LZ/Qrezz United States Patent MAGNETIC SEPARATOR FOR USE IN CONNEC- TION WITH AN ENDLESS CONVEYOR George J. Koren, Chicago, 111., assignor to Pettibone Mulliken Corporation, Chicago, Ill., a corporation of Delaware Application May 5, 1953, Serial No. 353,167

11 Claims. (Cl. 209-223) The present invention relates generally to magnetic sepa'rators. More particularly the invention relates to that type of magnetic separator which is adapted to be used in connection with a horizontally positioned endless belt variety conveyor for feeding granular material, such as molding sand, serves in connection with drive or opera- Another object of the invention is to provide a magnetic separator of the type under consideration in which the supporting structure is in the form of an open front and open bottom housing, embodies means whereby it may be mounted in fixed relation with the discharge end of the conveyor and embodies a back wall and a pair of side walls, and certain of the horseshoe magnets are mounted on the outer surface of the back wall and serve when small sized tramp articles, such, for example, as nuts and bolts, are directed toward the back wall in connection with discharge of the sand from the conveyor to cause such articles to adhere to the back wall.

Another object of the invention is to provide a magnetic separator of the last mentioned character in which the housing like supporting structure embodies, in addition to the back and side walls, a top wall which is upwardly inclined to a small extent in the direction of the discharge end of the conveyor, and the other horseshoe magnets are mounted on the upper surface of the top wall and serve when large sized tramp articles, such as gaggers, are directed against the bottom surface of the top wall to cause such articles to swing upwards and adhere to the top wall.

A further object of the invention is to provide a magnetic separator of the type and character under consideration in which the rear margin of the top wall of the housing like supporting structure is hinged to the top margin of the back wall in order that the top wall may be swung upwards into an open position so as to expose for removal purposes the collected tramp articles on the inner surface of the side wall and the bottom'surface of the top wall.

A still further object of the invention is to provide a magnetic separator which is generally of new and improved construction, eifectively and etficiently fulfills its intended purpose and is capable of being produced at a comparatively low cost.

Other objects of the invention and the various advantages and characteristics of the present magnetic separator will be apparent from a consideration of the following detailed description.

The invention consists in the several novelfeatures which are hereinafter set forth and are more particularly defined by claims at the conclusion hereof.

In the drawings which accompany and form a part of this specification or disclosure and in which like numerals of reference denote corresponding parts throughout the several views:

Figure 1 is a side view of a Sandslinger type flask filling apparatus having applied to the discharge end of the endless belt variety conveyor over the jib a magnetic separator embodying the invention;

Figure 2 is an enlarged vertical section on the line 2-2 of Figurel;

Figure 3 is a vertical section taken on the line 33 of Figure 2 and illustrating in detail the construction and:

arrangement of the housing-like supporting structure and the horseshoe magnets of the magnetic separator; and

Figure 4 is a fragmentary plan view of the separator.

The magnetic separator which is illustrated in the drawings constitutes the preferred form or embodiment of It is shown in connection with a Sand-.

the invention. slinger type apparatus for filling foundry flasks with molding sand and serves as a medium or instrumentality for removing tramp articles from the sand.

The flask filling apparatus is like that forming the subject matter of United States Letters Patent No. 2,339,001, dated January 11, 1944, and comprises a standard 5, a

horizontally extending jib 6, a horizontally extending arm' 7, a rotary projector 8, an endless conveyor 9 over the jib 6, and an endless conveyor 10 over the arm 7. The

standard 5 is adapted to rest on the floor of the foundry in which the apparatus is utilized. The jib 6 overlies the standard and consists of a vertically elongated housing 11,

an inner arm arrangement 12 and an outer arm arrangement 13. The housing 11 directly overlies the standard 5 and is rotatably mounted on a vertically extending spindle 14. The latter is connected to, and projects upwards from, the upper end of the standard and together with the housing 11 constitutes a pivotal connection whereby the jib 6 is permitted to swing back and forth about a vertical axis. The inner arm arrangement 12 extends radially with respect to the housing 11 and has its inner end connected to the central portion of the housing. The outer arm arrangement 13 forms a continuation of the inner arm arrangement 12 and has its inner end connected to the outer end of the inner arm arrangement. The arm 7 is disposed a small distance above the jib 6 and consistsof.

a housing 15 and a tube 16. The housing 15 overlies the outer end of the outer arm arrangement 13 of the jib and is pivotally connected thereto so that the arm 7 is free to swing back and forth about a vertical axis. The tube 16 of the arm 7 extends horizontally and has one end thereof connected to the housing 15. The rotary projector 8 is mounted on the other or outer end of the tube 16 and comprises a housing 17 and a blade-equipped rotor (not shown) within the housing. It is driven by an electric,

motor 18 and operates, when driven, to form wads of sand and to project the wads downwards in rapid succession into a subjacent flask (not shown). The electric motor 18 for driving the projector is mounted on the housing 15 of the arm 7 and is connected to the blade-equipped rotor of the projector by way of, a horizontal shaft which extends through the tube 16. The endless conveyor 9 extends lengthwise of the jib 6. It is adapted to feed sand in stream form to the endless conveyor 10 and consists of an elongated frame 19, a drive pulley 20, a driven pulley 21 and an endlessbelt 22 around the two pulleys. The end of the frame 19 that overlies the proximal end of the jib 6 is supported by way of a bracket structure 23 which is suitably connected to the upper end of the housing 11. The other end of the frame 19 is supported by way of a pair of laterally spaced rods 24 which comprise substantially'vertical lower parts 25 and substantially horizontal upper parts 26. The lower ends of the lower parts of the rods are fixedly connected to the central portion of the outer arm arrangement 13 of the jib 6. The substantially horizontal upper parts 26 of the rods underlie and project a short dis ance beyond the superjacent end of the frame 19. The drive pulley 29 is sup ported rotatably at the inner end of the frame 19, i. e.. the end of the frame that overlies the proximal end of the jib 6. It is driven by an electric motor 27 through the medium of gearing (not shown). mounted on the bracket structure 23. The driven pulley 21 is located at the outer end of the frame 19 and is provided at its ends with trunnions 28. The latter are journalled in the eyes of a pair of eyebolts 29. The shanks of such bolts extend lengthwise of, and are suitably connected to the outer end of, the frame 19. The eyes of the eyebolts 29 are provided with outwardly extending fingers 39 which rest on the substantially horizontal upper parts 26 of the rods 24. The drive pulley 20 is driven in a clockwise direction as viewed in Figure l to the end that the upper reach of the endless belt 22 moves from the inner end of the frame 19 to the outer end. A hopper 31 is mounted on the inner end of the frame 19 and serves to direct sand from an overhead sup ply source (not shown) onto the receiving end of the upper reach of the endless belt 22. The endless conveyor 10 receives sand fromthe discharge end of the upper reach of the endless belt 22 of the conveyor 9 and feeds the sand in stream form into the projector housing 17 via an opening in the upper portion of the. lattei'. it extends lengthwise of the projector carrying arm 7 and comprises an elongated frame 32, a drive pulley 33, a driven pulley 34 and an endless belt around the two pulleys. The frame 32 is suitably supported over the tube 16 of the arm 7. The drive pulley 33 is rotatably mounted at the inner end of the frame 32 and is driven in a clockwise direction as viewed in Figure 1 by way of anclcctric motor 36 and a belt and pulley connection 37. The driven pulley 34 is rotatably mounted at the outer end of the frame 32 and is disposed adjacent the upper portion of the projector housing 17. When the endless conveyor 10 is in operation as the result of drive of the electric motor 36 the upper reach of the endless belt 35 travels from the inner end of the frame 32 to the outer end. A hopper 38 is mounted on the inner end of the frame 32 and is adapted to receive sand from the discharge end of the upper reach of the endless belt 22 of the conveyor 9 and to direct the sand onto the inner or receiving end of the upper reach of the endless belt 35. When the fiask filling apparatus is in operation the sand that is delivered v by the endless conveyor 10 into the projector housing 17 is formed into wads by the flask carrying rotor of the projector and the wads, as heretofore pointed out. are flung downwards for flask filling purposes.

The magnetic separator is located at the discharge end of the endless conveyor 9 of the flask filling apparatus and serves to remove tramp articles of ferrous or similar metal from the sand as the latter is discharged in stream form from the discharge end of the upper reach of the endless belt 22. It is of unitary character and comprises an open front and open bottom housing 39, a horizontal series of horseshoe magnets and a horizontal series of horseshoe magnets 41.

The housing 39 serves as the supporting structure of the separator and comprises a back wall 42', a pair of inner corner forming Walls 43, a pair of outer corner forming walls 44, a pair of laterally spaced parallel side walls and a top wall 46. These walls are preferably formed of stainless steel in order that they are non-magnetic and have a high degree of resistance to wear. The back wall 42 of the housing is disposed in parallel relation with, and a short distance rearwards of, the driven pulley 21 of the endless conveyor 9 over the jib 6. It is rectangular and operates when the endless conveyor9 is in operation to deflect downwards and into the hopper 38 the The motor 27 is sand that is discharged in stream form from the discharge end of the upper reach of the endless belt 22. The inner corner forming walls 43 of the housing 39 have the inner side margins thereof formed integrally with the side margins of the back wall 42 and extend forwards at an angle of approximately 150' with respect to the back wall. The outer corner forming walls 44 have their inner side margins f'ormed integrally with the outer side margins of the inner corner forming walls 43 and extend forwards at approximately an angle of 150 with respect to the inner corner forming walls. The side walls 45 of the housing extend forwards from the outer corner forming walls 44 and have their inner side margins formed integrally with the outer side margins of the outer corner forming walls.

" The inner and outer corner forming walls serve to eliminate sharp right angle corners between the back wall and the side walls to the end that the sand that is discharged from the endless belt 22 will not pack or become jammed in the housing. The upper margins of the inner corner forming walls, the outer corner forming walls and the side walls of the housing are upwardly inclined in the direction of the driven pulley 21 and extend at approximately a 13 angle with respect to the horizontal. The top wall 46 of the housing 39 extends across and is adapted to rest on the top margins of the inner corner forming walls 43, the outer corner forming walls 44 and the side walls 45 and assist the back wall 42 in deflecting downwards into the hopper 33 the sand that is discharged from the endless conveyor 9. Because of the angle at which the top margins of the walls 43, 44 and 45 extend the top wall is normally positioned so that it is inclined upwards in the direction of the driven pulley 21 and extends at an angle of approximately 13 /2 with respect to the horizontal. As best shown in Figure 3 of the drawings the front margin of the top wall projects beyond the front side margins of the side walls 45 and is disposed a small distance above the upper portion of the driven pulley 21. The rear margin of the top wall 46 is connected to the top margin of the back wall 42 by way of a hinge 47 in order that the top wall may be swung upwards into an open position when access to the interior of the housing is desired. The housing is held in fixed relation with the discharge end of the endless conveyor 9 by way of a pair of angle brackets 48. Such brackets are located directly outwards of the housing side walls 45 and consist of horizontally elongated vertically extending legs 49 and horizontally extending legs 50. The vertically extending legs 49 fit against the central front portions of the outer surfaces of the side walls 45 and are secured in place by way of horizontal bolts 51 which extend through aligned holes in the vertically extending legs 49 and the contiguous portions of the housing side walls.

- The horizontally extending legs 59 of the angle brackets (iii 43 are connected to, and project outwards from, the bottom margins of the vertically extending legs 49 and rest on the rear extremities of the upper parts 26 of the rods 24. The brackets 43 are connected to the rear extremities of the upper parts 26 of the rods 24 by way of U-bolts 52. The central portions of these bolts extend around the bottom portions of the rear extremities of the upper parts 26 and the upper ends of the bolts extend through vertical holes in the horizontally extending legs of the brackets 43 and are provided with nuts 53. When the nuts are tightened to their fullest extent the U-bolts serve firmly to clamp the horizontally extending legs 50 of the brackets 48 against the upper portions of the rear extrcmities of the upper parts of the rods 24.

The horseshoe magnets 40 of the magnetic separator are arranged in an arcuate series around the back wall 42, the inner corner forming walls 43 and the outer corner forming walls 44 and are positioned so that the legs thereof are substantially horizontal and certain legs thereof are disposed above and in vertical alignment with the other legs. The outer ends of the upper legs of the horseshoe magnets 40 areflat and abut against the outer surface of a substantially horizontal strip 54 of steel or other magnetic material. The strip constitutes a' pole piece for the magnets 40 and is shaped conformably to the central portions of the outer surfaces of the back wall 42 and the inner and outer corner forming walls 43 and 44. Horizontal bolts 55 extend through aligned holes in the upper portion of the strip 54 and the adjacent portions of the walls 42, 43 and 44 of the housing and serve rigidly but removably to secure the pole piece forming strip in place. The upper legs of the magnets 40 are held in fixed relation with the strip 54 by way of substantially horizontal bolts 56 which extend through longitudinal holes 57 in the upper legs of the magnets. The ends of the bolts that are adjacent the outer or free ends of the upper legs of the magnets are'screw threaded and fit within threaded holes in the strip 54. The other ends of the bolts, i. e., the ends that are adjacent the inner ends of the upper legs of the magnets, are provided with externally disposed heads 58 whereby the bolts may be turned by a wrench or similar turning tool. The outer ends of the lower legs of the horseshoe magnets 40 are fiat and abut against the outer surface of a substantially horizontal strip 59 of steel or other magnetic material. The strip 59 constitutes a second pole piece for the magnets 40 and is shaped conformably to the lower portions of the outer surfaces of the back wall 42 and the inner and outer corner forming walls 43 and 44. Horizontal bolts 60 extend through aligned holes in the lower portion of the strip 59 and the adjacent portions of the walls 42, 43 and 44 of the housing and serve rigidly but 'removably to secure the pole piece forming strip 59 in place. The lower legs of the magnets 40 are connected to the strip 59 by way of substantially horizontal bolts 61 which extend through longitudinal holes 62 in the lower legs of the magnets 4t). The ends of the bolts that are adjacent the outer ends of the lower legs of the magnets are screw threaded and fit within threaded holes in the strip 59. The other ends of the bolts, i. e., the ends that are adjacent the inner ends of the lower legs of the magnets 40, are provided with exteriorly disposed heads 63 whereby the bolts may be turned by a wrench or similar turning tool. As best shown in Figure 4 the two outermost horseshoe magnets 40 are connected to the ends of the pole piece forming strips 54 and 59 and extend outwards from, and at right angles to, the outer corner forming walls 44 of the housing. The next two magnets, i. e., the magnets that are directly inwards of the two outermost magnets, are connected to the portions of the pole piece forming strips 54 and 59 that fit against the inner corner forming walls 43. They are angularly arranged with respect to the two outermost magnets and extend at right angles to the inner corner formingwalls 43. The other horseshoe magnets 40 are connected to the central portions of the strips 54 and 59. They extend at right angles to the back wall 42 and are preferably spaced apart to a small extent. As shown in Figure 3, the horseshoe magnets 40 are disposed at small distance beneath the discharge end of the upper reach of the endless belt 22. They create within the lower portion of the interior of the housing 39 a magnetic field which, when small sized tramp articles, such as nuts and bolts, are discharged with the sand into the lower portion of the housing interior, results in such articles being removed or separated from the stream of sand and brought into adhering relation with the inner surfaces of the back wall 42 and the corner forming walls 43 and 44 of the housing. The small sized tramp articles that are collected by the horseshoe magnets 40 may be removed from the walls 42, 43 and 44 either by sliding them downwards or, after swinging of the top wall 46 into its open position, sliding them upwards or pulling them away from said walls 42, 43 and 44.

The horseshoe magnets 41 are located over the central portion of the top wall 46 of the housing 39 and are arranged so that the legs thereof extend downwards. They extend in parallel relation with the side walls of the housing and are either the same in size as the horse shoe magnets, or larger. The lower ends of the front legs of the magnets 41 are flat and abut against the upper surfaces of a substantially horizontal strip 64 of steel or other magnetic material. The strip 64 constitutes a pole piece for the magnets 41 and fits flatly against the upper surface of the housing top wall 46. Substantially vertical bolts 65 extend through aligned holes in the front side margin of the strip 64 and the superjacent portions of the top wall 46 and serve rigidly but removably to secure the pole piece forming strip 64 in place. The front legs of the magnets 41 are connected to the strip 64 by way of substantially vertical bolts 66 which extend downwards through longitudinal holes 67 in the front legs of the magnets 41. The lower ends of the bolts are screw threaded and fit within threaded holes in the strip. 64. The upper ends of the bolts 66 are provided with exteriorly disposed heads 68 whereby the bolts may be turned by a wrench or similar turning tool. The lower ends of the rear legs of the horseshoe magnets 41 are flat and abut against the upper surface of a substantially horizontal strip 69. The latter is formed of the same magnetic material as the strip 64 and forms the other pole piece for the magnets 41. it fits flatly against the rear portion of the upper surface of the housing top wall 46' and is fixedly but removably secured in place by'substantially vertical bolts 70 which extend through aligned holes in the rear side margin of the pole piece forming strip 69 and the subjacent portions of the housing top wall 46. The rear legs of the'magnets 41 are connected to the strip 69 by way of substantially vertical bolts 71 which extend downwards through longitudinal holes 72 in the rear legs of the magnets 41. The lower ends of the bolts are screw threaded and fit Within threaded holes in the subjacent portions of the strip 69. The upper ends of the bolts 71 embody polygonal heads 73 in order that the bolts may be turned in connection with tightening or loosening thereof. The horseshoe magnets 41 create under the housing top wall 46 a magnetic field which, when large sized tramp articles, such, for example, as gaggers or steels rods, are discharged from the upper reach of the endless belt 22, results in such articles being separated from the stream of sand and attracted upwards against the lower surface of the top wall 46. If large sized tramp articles, such, for example, as gaggers, are included inthe sand on the upper reach of the endless belt 22 they generally assume a position wherein they extend lengthwise of the belt. When the articles are discharged from the upper reach of the belt the leading ends thereof strike against the under surface of the housing top wall 46. Because such top wall is upwardly and forwardly inclined to a small extent with respect to the horizontal the leading ends of the large sized tramp articles are deflected downwards to a slight extent with the result that the articles momentarily assume a position wherein they are substantially parallel to the housing top wall. At such time the horseshoe magnets 41 exert such an upward force that they cause the articles to adhere against the under surface of the top wall. The angle at which the housing top wall 46 is inclined with respect to the horizontal is critical. If the angle is too great the large sized tramp articles that strike against the bottom surface of the top wall, instead of being canted upwards into a position wherein they are in substantially parallel relation with the top wall, are abruptly arrested and tend to drop through the housing without being influenced by the magnets 40. On the other hand, if the angle is too small the large sized tramp articles, instead of striking against the bottom surface of the top wall, strike against the back wall and, because of their size, drop through the housing without being affected by the magnetic influence of the magnets 40. When it is desired to remove the tramp articles that are collected by the horseshoe magnets 41 the top Wall 46 of the housing is swung upwards into its open position and the collected articles are then slid out of the magnetic field that is created or produced by the magnets 41.

The herein described magnetic separator, due to the particular design and construction thereof, effectively and efficiently fulfills its intended purpose. It is capable of being produced at a comparatively low cost and may be mounted in place with facility. Because of the particular arrangement of its parts the separator lends itself readily for use with a high speed endless conveyor having at its discharge end a pulley of such small diameter that it could not accommodate an electro-magnct.

Whereas the magnetic separator has been described in connection with a Sandslin'ger variety flask filling apparatus it is to be understood that it has other capabilities of use and may be used at the discharge end of any endless belt variety conveyor for conveying granular material that may contain tramp articles of iron, steel or other magnetic material. it is also to be understood that the invention is not to be restricted to the details set forth since these may be modified within the scope l. A magnetic separator adapted for use with a substantially horizontal power driven endless belt variety conveyor for feeding in stream form granular material with magnetic tramp articles therein, operative to remove the articles from the granular material as the latter is discharged from the conveyor, and comprising an open front and open bottom housing embodying a back wall and a top wall and provided with means for supporting it in fixed relation with the discharge end of the conveyor and so that the open front thereof faces, the back wall is spaced :1 small distance rearwards of, and the top wall is a small distance above, said discharge end of the conveyor, a permanent magnet arrangement connected to the outer surface of the back wall of the housing and adapted when the conveyor is in operation to separate certain tramp articles from the discharged stream of granular material and magnetically to hold such certain articles against the inner surface of the back wall, and a permanent magnet arrangement connected to the top surface of the top Wall of the housing and adapted when the conveyor is in operation to separate other tramp articles from the discharged stream of granular material and magnetically to hold such other articles against the bottom surface of the top wall.

2. A magnetic separator adapted for use with a substantially horizontal power driven endless belt variety conveyor for feeding in stream form granular material with magnetic tramp articles therein, operative to remove the articles from the granular material as the latter is discharged from the conveyor, and comprising an open front and open bottom unitary housing embodying a back wall, a pair of side walls and a top wall and provided with means for supporting it in fixed relation with the discharge end of the conveyor and so that the open front thereof faces, the back wall is spaced a small distance rearwards of, and the top wall is a small distance above, said discharge end of the conveyor, a substantially horizontal series of permanent magnets connected to, and extending across, the outer surface of the back wall of the housing and adapted when the conveyor is in operation to separate certain tramp articles from'the discharged stream of granular material and magnetically to hold such certain articles against the inner surface of the back wall, and a substantially horizontal series of per manent magnets connected to, and extending across, the top surface of the top wall of the housing and adapted when the conveyor is in operation to separate other tramp articles from the discharged stream of granular material and magnetically to hold such other articles against the bottom surface of the top wall.

3. A magnetic separator adapted for use with a substantially horizontal power driven endless belt variety conveyor for feeding in stream form granular material with magnetic tramp articles therein, operative to remove the articles from the granular material as the latter is discharged from the conveyor, and comprising an open front and open bottom unitary housing embodying a back wall, a pair of side walls and a top wall and provided with means for supporting it in fixed relation with the discharge end of the conveyor and so that the open front thereof faces, the back wall is spaced a small distance rearward of, and the top wall is a small distance above, said discharge end of the conveyor, a substantially horizontal series of horseshoe magnets extending across, and having the free ends of the legs thereof connected to, the outer surface of the back wall of the housing and adapted when the conveyor is in operation to separate certain tramp articles from the discharged stream of granular material and magnetically to hold such certain articles against the inner surface of the back wall, and a substantially horizontal series of horseshoe magnets extending across, and having the free ends of the legs thereof connected to, the top surface of the top wall of the housing and adapted when the conveyor is in operation to separate other tramp articles from the discharged stream of granular material and magnetically to hold such other articles against the bottom surface of the top wall.

4. A magnetic separator adapted for use with a substantially horizontal power driven endless belt variety conveyor for feeding in stream form granular material with magnetic tramp articles therein, operative to remove the articles from the granular material as the latter is discharged from the conveyor, and comprising an open front and open bottom unitary housing embodying a back wall, a pair of side walls and a top wall extending across the upper margins of the side walls, means connected to certain walls of the housing other than the top wall and adapted to support said housing in fixed relation with the discharge end of the conveyor and so that the open front thereof faces, the back wall is spaced 0. small distance rearwards of, and the top wall when in its normal position is a small distance above, said discharge end of the conveyor, a permanent magnet arrangement connected to the outer surface of the back wall of the housing and adapted when the conveyor is in operation to separate certain tramp articles from the discharged stream of granular material and magnetically to hold such certain articles against the inner surface of the back wall, a permanent magnet arrangement connected to the top surface of the top wall of the housing and adapted when the conveyor is in operation to separate other tramp articles from the discharged stream of granular material and magnetically to hold such other articles against the bottom surface of the top wall, and a hinge connection extending between the rear margin of the top wall and the top margin of the back wall and arranged so as to permit said top wall to swing back and forth between its normal position wherein it extends across the top margins of the side walls and an open position wherein it extends upwards and exposes for removal purposes the collected articles on its bottom surface and the inner surface of the back wall.

5. A magnetic separator adapted for use with a substantially horizontal power driven endless belt variety conveyor for feeding in stream form granular material with magnetic tramp articles therein, operative to remove the articles from the granular material as the latter is discharged from the conveyor, and comprising an open front and open bottom unitary housing embodying a back wall, a pair of side walls connected to, and extending forwards from, the side margins of the back wall, and a top wall normally extending across, and resting on, the top margins of the side walls, means connected to the housing side walls and adapted to support the housing in fixed relation with the discharge end of the conveyor and so that the open front thereof faces, the back wall is spaced a small distance rearwards of, and the top wall when in its normal position is a small distance above, said discharge end of the conveyor, a substantially horizontal series of permanent magnets connected to the lower central portion of the outer surface of the back wall of the housing and adapted When the conveyor is in operation to separate certain tramp articles from the discharged stream of granular material and magnetically to hold such certain articles against the inner surface of the back wall, a substantially horizontal series of permanent magnets connected to the central portion of the top surface of the top wall of the housing and adapted when the conveyor is in operation to separate other tramp articles from the discharged stream of granular material and magnetically to hold such other articles against the bottom surface of the top wall, and a hinge connection extending between the rear margin of the top wall and the top margin of the back wall and arranged so as to permit said top wall to swing back and forth between its normal position wherein it extends across the top margins of the side walls and an open position wherein it extends upwards and exposes for removal purposes the collected articles on its bottom surface and the inner surface of the back wall.

. 6. A magnetic separator adapted for use with a substantially horizontal power driven endless belt variety conveyor for feeding in stream form granular material with magnetic tramp articles therein, operative to remove the articles from the granular material as the latter is discharged from the conveyor, and comprising an open front and ope'n'bottom unitary housing embodying a back wall, a pair of side walls and a top wall connected to certain walls of the housing and adapted to support said housing in fixed relation with the discharge end of the conveyor, so that the open front thereof faces, the back wall is spaced a small distance rea'rwards of, and the top wall 'is a small distance above, said discharge end of the conveyor, and also so that said top wall is upwardly and forwardly inclined at a comparatively small angle with respect to the horizontal, a permanent magnet arrangement connected to the outer surface of the back wall of the housing and adapted when the conveyor is in operation to separate certain tramp articles from the discharged stream of granular material and magnetically to hold such certain articles against the inner surface of the back wall, and a permanent magnet arrangement connected to the top surface of the top Wall of the housing and adapted when the conveyor is in operation to separate other tramp articles from the discharged stream of granular material and magnetically to hold such other articles against the bottom surface of the top wall.

7. A magnetic separator adapted for use with a substantially horizontal power driven endless belt variety conveyor for feeding in stream form granular material with magnetic tramp articles therein, operative to remove the articles from the granular material as the latter is discharged from the conveyor, and comprising an open front and open bottom unitary housing embodying a back wall, a pair of side walls, and angularly disposed corner forming walls between the adjoining side margins of the back and side walls, means connected to certain of the walls of the housing and adapted to support said housing in fixed relation with the dis charge end of the conveyor and so that the open front thereof faces, and the back wall is spaced a small distance rearwards of, said discharge end of the conveyor, and a substantially horizontal series of permanent horseshoe magnets disposed exteriorly of the housing, arranged so that the outermost magnets extend at right angles to, and have the free ends of their legs in connected relation with, the corner forming walls and the intermediate or other magnets extend at right angles to, and have the free ends of their legs in connected relation with,

the housing back wall, and adapted when the conveyor is in operation to separate tramp articles from the dis charged stream of granular material and magnetically to hold such articles against the inner surfaces of the back and corner forming walls.

8. A magnetic separator adapted for use with a substantially horizontal power driven endless belt variety conveyor for feeding in stream form granular material with magnetic tramp articles therein, operative to remove the articles from the granular material as the latter is discharged from the conveyor, and comprising an open front and open bottom unitary housing embodying a back wall, a pair of side walls, angularly disposed corner forming walls between the adjoining side margins of the back and side. walls, and a top wall extending across the top margins of the other walls, means connected to certain of the walls of the housing and adapted to support said housing in fixed relation with the discharge end of the conveyor and so that the open front thereof faces, the back wall is spaced a small distance rearwards of, and the top wall is a small distance above, said discharge end of the conveyor, a substantially horizontal series of permanent horseshoe magnets disposed exteriorly of the housing, arranged so that the outermost magnets of the series extend at right angles to, and have the free ends of their legs in connected relation with, the corner forming walls and the intermediate or other magnets extend at right angles to, and have the free ends of their legs in connected relation with, the housing back wall, and adapted when the conveyor is in operation to support certain tramp articles from the discharged stream of granular material and magnetically to hold such articles against the inner surfaces of the back and corner forming walls, and a substantially horizontal series of permanent horseshoe magnets extending across, and having the free ends of the legs thereof connected to, the top surface of the housing top wall and adapted when the conveyor is in operation to support other tramp articles from the discharged stream of granular material and magnetically to hold such other articles against the bottomsurface of the top wall.

9. In combination with a substantially horizontal power driven endless belt variety conveyor for feeding in stream form granular material with magnetic tramp articles therein, and conveyor supporting means including a pair of laterally spaced members with certain ends thereof extending substantially horizontally and disposed on opposite sides of, and projecting a short distance beyond, the discharge end of the conveyor; a magnetic separator disposed adjacent the discharge end of the conveyor, operative to remove the articles from the granular material as the latter is discharged from the conveyor, and comprising an open front and open bottom housing embodying a back wall disposed a small distance rearwards of said discharge end of the conveyor, a pair of laterally spaced side walls connected to, and extending forwards from, the side margins of the back wall and positioned between said certain ends of the members of the conveyor supporting means, and a top wall extending across the top margins of the back and side walls and positioned a small distance above the discharge end of the conveyor, a pair of mounting brackets connected to the side walls, resting on, and removably connected to, said certain ends of the aforesaid members and serving to hold the housing in fixed relation with the conveyor, a permanent magnet arrangement connected to the outer surface of the housing back wall and adapted when the conveyor is in operation to separate certain tramp articles from the dis charged stream of granular material and magnetically to hold such certain articles against the inner surface of the back wall, and a permanent magnetic arrangement connected to the top surface of the housing top wall and adapted when the conveyor is in operation to separate other tramp articles from the discharged stream of granular material and magnetically to hold such other tramp articles against the bottom surface of the top wall.

10. In combination with a substantially horizontal power driven endless belt variety conveyor for feeding in stream form granular material with magnetic tramp articles therein, and conveyor supporting means including a pair of laterally spaced members with certain ends thereof extending substantially horizontally and disposed on opposite sides of, and projecting a short distance beyond, the discharge end of the conveyor; a magnetic separator disposed adjacent the discharge end of the conveyor, operative to remove the tramp articles from the granular material as the latter is discharged from the the conveyor, and comprising an open front and open bottom housing embodying a back wall disposed a small distance rearwards of said discharge end of the conveyor, a pair of laterally spaced side walls connected to, and extending forwards from, the side margins of the back Wall and positioned between said certain ends of the members of the conveyor supporting means, and a top wall extending across the top margins of the back and side walls and positioned a small distance above the discharge end of the conveyor, a pair of angle brackets operative fixedly but removably to hold the housing in fixed relation with the conveyor and consisting of vertical legs connected to the outer surfaces of the side walls, and horizontal legs resting on the certain ends of the aforesaid members and provided with U-bolts in encircling relation with certain ends, a substantially horizontal series of permanent magnets connected to the outer surface of the housing back wall and adapted when the conveyor is in operation to separate certain tramp articles from the discharged stream of granular material and magnetically to hold such certain article's against the inner surface of the back wall, and a substantially horizontal series of permanent magnets connected to the top surface of the housing top Wall and adapted when the conveyor is in operation to separate other tramp articles from the discharged stream of grannular material and magnetically to hold such other tramp articles against the bottom surface of the top wall.

11. In combination with a substantially horizontal power driven endless belt variety conveyor for feeding in stream form granular material with magnetic tramp articles therein, and conveyor supporting means including a pair of laterally spaced members with certain ends thereof extending substantially horizontally and disposed on opposite sides of, and projecting a short distance beyond, the discharge end of the conveyor; a magnetic separator disposed adjacent the discharge end of the conveyor, operative to remove the tramp articles from the granular material as the latter is discharged from the conveyor, and comprising an open front and open bottom housing embodying a back wall disposed a small distance rearwards of said discharge end of the conveyor, :1 pair of laterally spaced side walls connected to, and extending forwards from, the side margins of the back wall and positioned between said certain ends of the members, and a top wall extending normally across the upper margins of the side walls and so that it is upwardly and forwardly inclined at a comparatively small acute angle with respect to the horizontal, mounting brackets connected to the side walls of the housing, connected removably to said certain ends of the aforementioned members and serving to hold the housing in fixed relation with the conveyor, a substantially horizontal series of permanent horseshoe magnets extending across, and having the free ends of the legs thereof connected to, the outer surface of the back wall of the housing and adapted when the conveyor is in operation to separate certain tramp articles from the discharged stream of granular material and magnetically to hold such certain articles against the inner surface of the back wall, a substantially horizontal series of permanent horseshoe magnets extending across, and having the free ends of the legs thereof connected to, the top surface of the top wall of the housing and adapted when the conveyor is in operation to separate other tramp articles from the discharged stream of granular material and magnetically to hold such other articles against the bottom surface of the top wall, and a hinge connection extending between the rear margin of the top Wall and the top margin of the back wall and arranged so as to permit said top wall to swing back and forth between its normal position wherein it extends across the top margins of the side walls and an open position wherein it extends upwards and exposes for removal purposes the collected articles on its bottom surface and the inner surface of the back wall.

No references cited. 

